Hairpin



FIG. 1 is a perspective view of a hairpin showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a perspective view thereof, shown in an environment of use.

The broken lines shown in the drawings depict environmental structure that forms no part of the claimed design. 

CLAIM The ornamental design for a hairpin, as shown and described. 